If you signed a private construction contract in California this year, your customer can only hold back half of what they used to — and if your billing templates still say 10%, you are leaving your own cash in their hands.
Since January 1, 2026, California law caps retention on most private construction projects at 5% of each progress payment, down from the 10% that had been the industry standard for decades. On a $2 million contract, that is the difference between $200,000 of your money sitting with the owner until the end of the job and $100,000. For a contractor running several jobs at once with payroll due every Friday, that freed-up cash can be the difference between self-funding the next project and drawing on a credit line to make payroll.
Here is what the new cap actually requires, who it covers, and how to rebuild your retainage bookkeeping so the money the law freed up actually reaches your bank account.
What SB 61 Changed
Senate Bill 61, signed in July 2025, added Section 8811 to the California Civil Code. The rule is short and strict:
- No more than 5% of any single progress payment may be withheld as retention — by the owner from the general contractor, by the general from any subcontractor, and by a subcontractor from any lower-tier sub.
- Total retention over the life of the project cannot exceed 5% of the contract price. This aggregate cap matters: it prevents each tier from stacking its own 5% on top of the last.
- The cap applies at every tier of the contracting chain, and an upper-tier contractor may not withhold a higher percentage from a sub than the owner withholds from them.
Before this law, California let private parties negotiate retention freely, and 10% was the near-universal default. Public projects in the state were already subject to a 5% cap, so SB 61 effectively extends to private work the protection public-work contractors have had for years.
Two enforcement details give the cap teeth. First, it applies to contracts entered into on or after January 1, 2026 — the law is prospective, so jobs already underway keep their original terms. Second, courts must award reasonable attorney's fees to the prevailing party in a dispute over compliance, which raises the stakes of trying to hold 10% anyway and hoping nobody notices.
Which Projects Are Covered — and the Two Big Exceptions
The cap covers private works of improvement: commercial buildings, industrial facilities, mixed-use developments, and larger residential projects. Two exceptions remove a meaningful slice of work:
1. Most purely residential projects are excluded. Single-family homes, duplexes, and apartment buildings of four stories or fewer keep the old negotiate-anything regime — unless the project is mixed-use (business plus residential), in which case the cap applies. If you do both commercial and residential work, you now operate under two retention regimes, and your contracts and billing need to know which job is which.
2. A subcontractor that fails to provide required performance and payment bonds loses the cap's protection — but only if the bonding requirement was communicated in writing before or at the time of bidding. General contractors who want this safety valve must put the bonding requirement in the bid documents, not raise it for the first time after award.
A practical consequence: for jobs spanning the transition — bid in 2025, signed in 2026 — the execution date of the contract controls, not the bid date. Review every agreement you signed after New Year's Day against the new ceiling.
The Cash-Flow Math: What 5% vs. 10% Means on a Real Job
Take a $1.2 million commercial tenant-improvement contract billed evenly over six months at $200,000 per month:
- Under the old 10% norm, the owner withheld $20,000 a month. By month five, $100,000 of earned revenue was locked up — while you had already paid the labor, materials, and sub invoices behind those billings.
- Under the 5% cap, the owner withholds $10,000 a month, or $50,000 by month five. That is $50,000 of additional cash in your account during the exact stretch of the job when costs peak.
Now multiply that across three or four concurrent jobs and the effect compounds: contractors who used to carry $300,000–$400,000 in outstanding retainage on private work may now carry half that. That changes how much working capital you need, how large a line of credit you must maintain, and — for subs — how long you can float slow-paying generals.
But the money only helps if your books reflect it. Owners do not automatically send you the difference; your pay applications have to claim it.
Rebuilding Your Retainage Receivable Schedule
Retainage is not regular accounts receivable — it is money you have earned but cannot collect until a future event (usually substantial or final completion). Sound construction bookkeeping tracks it separately. Here is how to reset that system for the 5% era:
1. Split pre-2026 and post-2026 contracts in your books
Because the cap turns on the contract date, your retainage ledger needs a contract-date field, or better, separate control accounts: one for jobs under the old negotiated terms and one for jobs under the cap. The most common transition error is applying one rule to every job — either under-billing new jobs at the old 10% or wrongly demanding 5% treatment on a 2025 contract that still legally carries 10%.
2. Keep retainage receivable separate from trade AR
Book retention to a dedicated retainage-receivable account per job, not lumped into general accounts receivable. Your balance sheet should let you answer in seconds: how much have we billed, how much has been retained, and how much of that retention is currently billable. If retainage is buried inside trade AR, your aging report overstates collectible receivables and understates the cash trapped until closeout.
3. Reconcile every pay application to the AIA paperwork
On AIA-style billing, the G702 application summarizes retention withheld to date and the G703 continuation sheet carries it by line item. Each month, tie your books to those forms: retention withheld this period, cumulative retention, and the resulting current payment due. When the owner's 5% math and yours disagree — wrong base, retention taken on stored materials or change-order work that the contract treats differently — that reconciliation is where you catch it, while the application is still open rather than at final payment.
4. Age your retainage like you age your receivables
Build a retainage schedule that shows, per job: contract price, amount billed to date, retention held to date, the retention rate applied, and the expected release date. Review it monthly alongside your AR aging. Retention that sits past its release trigger — final completion, notice of completion, acceptance — is a collection item, not a passive balance. Jobs in California now also benefit from a companion reform worth calendaring (see below), which shortens how long disputed change-order amounts can sit unpaid.
5. Track the aggregate, not just the per-payment rate
The statute caps both the per-payment withholding and total retention at 5% of contract price. On jobs with change orders that increase the contract sum, recompute the ceiling: 5% of the adjusted price is a larger number, and your schedule should show the updated cap so neither you nor the owner withholds past it — or leaves money unclaimed below it.
Update Your Contract Templates, Not Just Your Invoices
The bookkeeping only works if the paper underneath it complies. Before your next private job:
- Replace 10% retention defaults in your prime-contract and subcontract templates with 5%, including flow-down clauses so every tier matches.
- Cap the sub-tier withholding explicitly: the law already forbids withholding a higher percentage downstream than the owner holds upstream, but writing that parity into the subcontract prevents disputes about what was agreed.
- Put bond requirements in the bid package in writing if you want the bonding exception available — a verbal ask at precon does not preserve it.
- Add a line to your precon checklist confirming the contract execution date and whether the job is mixed-use or over four stories, so residential-exception jobs do not accidentally get capped language (or vice versa).
- Brief your project managers, because retention errors usually start in the field: a PM who approves a sub's 10%-retention pay app out of habit creates a compliance problem the back office then has to unwind.
Don't Miss the Companion Law: Faster Change-Order Payment
SB 61 arrived with a sibling reform, the Private Works Change Order Fair Payment Act (SB 440), effective the same day for the same post–January 1, 2026 contracts. It imposes a mandatory process for change-order and time-extension claims on private work: owners must respond in writing within 30 days, sorting disputed from undisputed amounts, and undisputed amounts must be paid within 60 days. Contractors gain a statutory right to stop work if owners do not comply.
For your books, that means change-order work gets its own track: date the claim was submitted, the 30-day response deadline, undisputed vs. disputed split, and the 60-day payment clock. Paired with the 5% retention cap, the two laws attack the same disease — your cash trapped in someone else's process — from both ends. Set up the tracking once and both improve.
Common Mistakes to Avoid
- Billing new jobs at the old 10%. Muscle memory is the biggest leak. Audit every active private job's applied rate this month.
- Demanding 5% treatment on pre-2026 contracts. The law is prospective; a 2025 contract with 10% retention is still enforceable.
- Stacking 5% at every tier. The aggregate cap is 5% of the contract price, total. Each tier withholding a full 5% of its own subcontract can breach the ceiling on the project as a whole.
- Burying retainage in general AR. If you cannot report retention held per job in one query, your closeout collections will lag.
- Ignoring the residential boundary. A four-story apartment block and a five-story one now have different retention rules; classify the job before you bill it.
- Forgetting the bond-notice paperwork. GCs who require sub bonds but never put it in writing at bid time have given up the exception without knowing it.
Simplify Your Financial Management
Recalibrating retention schedules, contract templates, and change-order clocks is exactly the kind of multi-job bookkeeping that rewards clean, auditable records. Beancount.io provides plain-text accounting that gives you complete transparency and control over your financial data — no black boxes, no vendor lock-in. Get started for free and keep every dollar of retainage exactly where you can see it.